Half Stack Developer | Building Scalable Web and Mobile Applications for Businesses

github

Mahmud Rahman  • Peerlist

<h3>Comprehensive Productivity and Document Suite</h3>This powerful, offline application is designed to replace over 30 individual utility apps, offering a unified, privacy-first toolkit. It seamlessly integrates professional PDF management, QR and barcode scanning, advanced AI features, and a suite of developer utilities, all within a lightning-fast interface.<ul><li>PDF &amp; Document Tools: Effortlessly manage, convert, edit, and protect your files with zero quality loss. Features include Image to PDF, Text to PDF, Scan to PDF, PDF to Images conversion, PDF merging and splitting, PDF compression, adding watermarks and page numbers, a PDF metadata editor, and the ability to fill PDF forms.</li><li>QR &amp; Barcode Tool: A fast, reliable, and secure scanner and generator for all standard QR and Barcode formats (EAN, UPC, WiFi, URLs). It allows for the creation of custom QR codes and exports scan history in Excel or TXT formats.</li><li>AI Tools: Supercharge your workflow with integrated, privacy-focused AI capabilities. This includes a PDF Summarizer, Smart Reply for messages, a Text Enhancer to refine writing, a Grammar Fixer, and a Writing Assistant. It also supports Bring Your Own Key (BYOK) for direct, private AI experiences using external API keys.</li><li>Invoice Generator &amp; Billing Suite: Build professional invoices with 7 premium templates, company branding, logo support, multi-currency options, and export to PDF/JPG. Drafts are auto-saved offline.</li><li>Productivity Tools: Includes a Markdown Editor with PDF/HTML export, a Clipboard Manager, Notes &amp; To-Do Lists with smart notifications, a Professional Teleprompter, and a Timezone Meeting Planner.</li><li>Developer &amp; Utility Tools: A comprehensive set of tools such as calculators (standard, EMI, aspect ratio), a Password Generator, Text Encoding/Decoding (Base64, Hex, Binary, URL), Color Picker, Digital Ruler, Stopwatch &amp; Timer, Unit Converter, and a Bubble Level.</li></ul>Key Benefits:<ul><li>Privacy First: All data and files remain on your device with zero tracking.</li><li>Offline Support: Most features function without an internet connection.</li><li>Lightning Fast: Optimized for speed and performance.</li><li>Beautiful Design: Intuitive and user-friendly interface.</li><li>Free Core Features: Access essential tools for free, with options to bypass limits via ads or BYOK.</li><li>Lightweight: Replaces numerous apps, saving battery and storage.</li></ul>

DocQR Tools - PDF - QR & AI

DocQR Tools – Your Complete Offline Productivity &amp; Document Suite Replace 30+ apps with one powerful, beautiful, privacy-first toolkit. DocQR Tools combines professional PDF tools, QR &amp; barcode scanning, productivity features, and developer utilities in a lightning-fast offline app. 📄 PDF &amp; DOCUMENT TOOLS Manage, convert, edit, and protect your files on the go with zero quality loss: • Image to PDF &amp; Text to PDF: Convert photos, scans, and notes to high-quality documents instantly. • Scan to PDF: Turn your device's camera into a portable document scanner. • PDF to Images: Stream convert PDF pages into high-resolution JPG or PNG formats. • Merge &amp; Split PDFs: Combine files or extract specific pages seamlessly. • Compress PDFs: Reduce file size for easy emailing/sharing without quality loss. • Add Watermarks &amp; Page Numbers: Personalize, number, or protect your documents with custom layouts. • PDF Metadata Editor: Customize title, author, subject, and keywords for better file indexing. • Fill PDF Forms: Complete interactive fields, select checkboxes, and input text instantly. 🔍 QR &amp; BARCODE TOOLS Fast, reliable, and secure scanner &amp; generator: • Universal Scanner: Instantly scan all standard QR &amp; Barcode formats (EAN, UPC, WiFi, and URLs). • Generate Custom QR Codes: Create codes for contacts, websites, WiFi, and clipboard text. • Export Scan History: Never lose your scans. Save and export scan history directly in Excel or TXT formats. • WiFi QR Connect ✨ POWERFUL, FLEXIBLE AI TOOLS Supercharge your workflow with integrated, privacy-focused AI. No tracking, just fast results. • PDF Summarizer: Upload a PDF and let AI read and summarize long documents in seconds. • Smart Reply: Paste a message and instantly get the perfect, context-aware reply. • Text Enhancer: Make your writing sound more professional, casual, or persuasive. • Grammar Fixer: Instantly correct typos and grammatical errors. • Writing Assistant: Overcome writer's block with intelligent suggestions. • Bring Your Own Key (BYOK) Support: Simply plug in your own API key (like OpenRouter) for a direct, high-performance, and private AI experience, completely bypassing all coins and ad limits. 💼 REVOLUTIONIZED INVOICE GENERATOR &amp; BILLING SUITE Build client-ready professional invoices anywhere, anytime: • 7 Premium Templates: Choose from Classic, Modern, Minimal, Corporate, Retail, Service, and Creative styling options. • Company Branding &amp; Logo Support: Add your business name and custom logo to the header. • Multi-Currency Support • Export to PDF &amp; JPG • Offline Auto-Save Drafts ⚡ PRODUCTIVITY TOOLS • Markdown Editor: Write notes, edit, and preview Markdown with PDF/HTML export. • Clipboard Manager: Save, search, and transform text snippets from your clipboard history. • Notes &amp; To-Do Lists: Stay organized with priority tasks and 🔔 Smart Notifications. • Professional Teleprompter: Record videos or present smoothly with scrollable scripts. • Timezone Meeting Planner: Coordinate times across different zones easily. 🛠️ DEVELOPER &amp; UTILITY TOOLS • Calculators: Standard calculator, Loan/EMI estimator, and Aspect Ratio visual analyzer. • Password Generator: Generate strong, encrypted passwords instantly. • Text Encoding: Encode and decode Base64, Hex, Binary, and URL schemes. • Color Picker • Digital Ruler • Stopwatch &amp; Timer • Unit Converter: Convert length, weight, temperature, data size, and more. • Bubble Level: Quick level-alignment tool. WHY CHOOSE DOCQR TOOLS? 🔐 PRIVACY FIRST – All files, PDFs, and data stay on your device. Zero tracking. Zero cloud. 📴 OFFLINE Supported 🚀 LIGHTNING FAST 🎨 BEAUTIFUL DESIGN 💰 FREE CORE FEATURES – Access all primary tools. Bypass limits easily by watching short ads or using your own API key. 🚫 OPT-IN EXPERIENCES – Enjoy clean utility focus. No mandatory distraction. ⚡ LIGHTWEIGHT – Replaces 30+ bulky utility apps while saving battery and storage space. 📥 DOWNLOAD NOW &amp; SIMPLIFY YOUR DIGITAL LIFE

DocQR Tools - PDF, QR & AI

Smart Reply, Enhance &amp; Translate is a full-stack AI tool suite built to boost productivity for anyone who works with text. Whether you're a support agent handling repetitive messages, a freelancer drafting professional emails, or someone who needs quick translations, this project provides a seamless experience across multiple platforms.The suite consists of three client interfaces, a browser extension (Chrome/Firefox), a React web application, and a Flutter mobile app, all powered by a shared Node.js backend that communicates with state-of-the-art LLMs via <a target="_blank" rel="nofollow" class="break-all link-break text-gray-500 hover:underline" href="https://openrouter.ai/">OpenRouter</a>.<h3>Key Features</h3><ul><li>4 AI suggestions per request across all three modes (Reply, Enhance, Translate)</li><li>6 response formats — Professional, Friendly, Casual, Formal, Flirty, Romantic — with tooltip descriptions</li><li>Multi-language translation — English, Spanish, French, German, Chinese, Arabic, Bengali, and more</li><li>Multiple free LLM models — automatically selects the best model per operation type</li><li>LLM-agnostic — compatible with any OpenRouter-supported model (free or paid)</li><li>Custom API key support — bring your own key for full privacy and control</li><li>SHA256-based intelligent caching — prevents duplicate API calls, 5-minute TTL</li><li>Docker support — spin up the backend with a single command</li><li>Browser Extension (Chrome/Firefox) — insert text directly into any field, keyboard shortcut Ctrl+Shift+T, context menu integration, auto-detect selected text</li><li>Web App — animated UI with Framer Motion, auto-resizing textarea, keyboard shortcuts (Ctrl/Cmd + Enter), responsive and accessible</li><li>Mobile App (Flutter) — native Android support, optimized for on-the-go usage</li></ul>Smart Reply is open source, allowing you to customize and deploy it according to your needs. Enhance your productivity and communication with this AI-powered assistant.

Smart Reply

Open Voice AI is an innovative, open-source platform that allows users to interact with a Large Language Model (LLM) using voice commands. This project is designed to be fully free, leveraging browser-native APIs and free-tier LLMs to create a seamless voice-based AI assistant. Key features include:<ul><li>Free &amp; Open Source: No need for paid APIs, credits, or subscriptions.</li><li>Voice Input (Speech-to-Text): Utilizes the Web Speech API for capturing voice commands.</li><li>AI Processing: Integrated with OpenRouter’s free-tier models for intelligent responses.</li><li>Voice Output (Text-to-Speech): Uses native browser SpeechSynthesis for spoken replies.</li><li>Cross-Platform Compatibility: Works on Chrome and Edge browsers across various operating systems.</li><li>Minimal Backend: A simple Express.js proxy to handle LLM requests securely.</li><li>Customizable: Easily swap LLMs or extend functionality.</li></ul>This project is ideal for developers and hobbyists interested in building accessible AI tools without financial barriers. It demonstrates a complete voice-based LLM interaction loop, making AI development more democratised and accessible.

Open Voice AI

Optimize Your Resume with AI-Powered InsightsEnhance your CV with our AI-powered application designed to optimise resumes using advanced LLMs. This innovative tool allows users to upload their PDF CVs and analyse them against specific job descriptions. Leveraging AI, it provides actionable suggestions, ATS scoring, and improvement tips to increase your chances of getting noticed by potential employers.<h3>Key Features</h3><ul><li>Upload PDF CV – Supports text-based PDFs for seamless analysis.</li><li>Job Description Input – Tailor your CV to specific job postings for better alignment.</li><li>AI-Powered Analysis – Utilise OpenRouter's free LLM models for comprehensive insights.</li><li>Error Handling – Gracefully manages API rate limits to ensure smooth operation.</li></ul>Our platform is built on the robust MERN stack, ensuring a reliable and efficient user experience. Whether you're a job seeker looking to refine your resume or a professional aiming to stay competitive, our tool offers the insights you need to succeed.

Resume Analizer

CopyNest is a smart, lightweight desktop tool designed to enhance your clipboard management experience. This modern clipboard manager, built with Python, automatically saves everything you copy, whether text or images, into a searchable and organized local history. With its sleek CustomTkinter GUI, CopyNest offers a range of features tailored for productivity enthusiasts. <h3>Key Features</h3><ul><li>Automatic Clipboard Monitoring: Captures text and images from your clipboard as you copy them.</li><li>Text &amp; Image Support: Stores and previews text snippets and images with thumbnail previews.</li><li>Advanced Search &amp; Filtering: Search by content, date, type, or tags with options for date range filtering and favorites-only view.</li><li>Favorites &amp; Tags: Mark items as favorites or add custom tags for better organization.</li><li>Export &amp; Import: Save history as JSON or ZIP and import back seamlessly.</li><li>Customizable Settings: Toggle between dark/light themes, enable/disable clipboard monitoring, and set custom hotkeys.</li><li>Performance Optimizations: Limits display to the last 100 items for a smooth UI experience.</li></ul>CopyNest is open source, allowing users to contribute and enhance its functionality. It is ideal for those who need quick recall of copied content, making it an essential tool for boosting productivity.

CopyNest is your personal clipboard companion

<a target="_blank" rel="noopener noreferrer" class="break-all link-break text-gray-500 hover:underline" href="https://taptapmaster.vercel.app/">TapTap</a>&nbsp;is an enjoyable, interactive web game where players tap a virtual coin to earn points, aiming to collect as many coins as possible. Featuring a daily goal progress bar, streak rewards, and vibrant animations, it provides an engaging experience. Players can track their stats, compete on a leaderboard, and enjoy sound and haptic feedback. The app uses MongoDB to store user data and tokens for seamless auto-login, ensuring a personalised experience across sessions.

TapTap Master - Ultimate Tapping Game

The Customer Service Centre is a comprehensive web-based application designed to streamline customer queue management and enhance service efficiency. This innovative platform allows customers to register with their name and phone number, receive a unique token, and wait for their turn in the queue. Agents can efficiently manage consultations by calling customers, tracking ongoing services, and marking them complete, all with real-time updates across the system.<h3>Key Features</h3><ul><li>Customer Registration: Easy registration with name and phone number.</li><li>Token Generation: Automatic, unique token generation for each customer.</li><li>Real-time Updates:&nbsp;Utilises WebSockets for live updates to all connected clients.</li><li>Agent Call System: Allows agents to call the next customer for consultation.</li><li>Consultation Management: Tracks and updates the status of ongoing consultations.</li><li>Excel Export: Export customer data to Excel for reporting purposes.</li><li>User Authentication: Secure login and registration for agents using JWT-based authentication.</li></ul>Built with a robust tech stack including Node.js, Express.js, MongoDB, and React.js, this application ensures seamless integration and a user-friendly interface. The use of Tailwind CSS and Framer Motion enhances the visual appeal and user experience, making it a valuable tool for any customer service centre.

Customer-Service-Center

Multi-LLMs-Chat is an innovative PWA application designed to enhance user interaction with multiple AI language models simultaneously. This tool allows users to compare responses from different AI models, manage chat history, and customize settings to suit their preferences. The application leverages modern technologies such as React, TailwindCSS, and Zustand for state management, ensuring a seamless and efficient user experience.<h3>Key Features</h3><ul><li>API Keys Management: Easily select desired AI models and enter valid API keys for each.</li><li>Prompt Input: Users can enter prompts and generate responses from multiple AI models.</li><li>Chat History: View and manage past interactions in the 'Chat History' modal.</li><li>Usage Statistics: Access detailed usage stats in the 'Statistics' modal.</li><li>Customizable Settings: Adjust themes and temperature settings to personalize the experience.</li></ul>This application is a valuable tool for developers and AI enthusiasts looking to explore and compare the capabilities of various language models. With its user-friendly interface and robust feature set, Multi-LLMs-Chat is a must-have for anyone working with AI technologies.

Multi-LLMs Chat -  Chat with multiple AI

ToastaX is a modern, customizable, and accessible toast notification library designed specifically for React applications. Built with TypeScript, it offers a flexible, promise-based API for displaying notifications with a variety of rich themes, animations, sizes, shapes, and interactive features. Optimized for performance and accessibility, ToastaX supports progress bars, swipe-to-dismiss, custom styling, toast clustering, and responsive design, making it ideal for modern web applications.<h3>Key Features</h3><ul><li>Customizable Styling: Choose from themes like light, dark, system, minimal, and various gradients, with options for different sizes, shapes, and opacity levels.</li><li>Animations: Enjoy smooth entrance/exit animations such as slide, fade, bounce, zoom, and flip, with reduced motion support.</li><li>Promise-Based API: Seamlessly handle asynchronous operations with loading, success, and error states.</li><li>Accessibility: Includes ARIA attributes, screen reader support, high-contrast mode, and reduced motion compatibility.</li><li>Interactivity: Features draggable toasts, swipe-to-dismiss, pause on hover/focus, and custom action buttons.</li><li>Responsive Design: Adapts to mobile devices with dynamic positioning and sizing.</li><li>TypeScript Support: Fully typed with comprehensive TypeScript definitions for a robust developer experience.</li></ul>ToastaX is easy to install via npm or yarn and can be extended with plugins for sound, vibration, and analytics. It is optimized for performance with lazy rendering, virtual scrolling, and batch updates, ensuring efficient rendering in any application.

toastax - npm package

IP-Checker is an open-source tool designed to help developers and users check IP addresses efficiently. Hosted on GitHub, this project leverages modern web technologies to provide a seamless experience. The application is primarily built using TypeScript, ensuring type safety and robust code. It also incorporates CSS for styling and JavaScript for dynamic functionalities. The project is deployed on Vercel, offering fast and reliable hosting solutions.Key features of IP-Checker include:<ul><li>Easy-to-use interface for checking IP addresses.</li><li>Open-source code available for contributions and improvements.</li><li>Integration with GitHub for version control and collaboration.</li><li>Efficient deployment with Vercel for quick updates and scalability.</li></ul>Whether you're a developer looking to contribute or a user needing a reliable IP checking tool, IP-Checker offers a comprehensive solution with its open-source nature and modern tech stack.

IP-Checker

The Chatbot 2.0 is an innovative conversational AI tool designed to enhance user interaction by answering questions and solving mathematical problems. This tool offers a user-friendly interface that ensures seamless communication, making it ideal for handling basic conversational flows. Key Features include:<ul><li>Text-Based Interaction: Provides relevant text replies to user input.</li><li>Predefined Commands: Supports commands for tasks like greetings, help, and information retrieval.</li><li>Context Awareness: Maintains basic conversation context for coherent interactions.</li><li>Extensibility: Easily extendable with additional features or integration with external APIs.</li><li>Mathematics: Capable of solving mathematical questions.</li></ul>Built with a focus on extensibility, the Chatbot 2.0 can be customized to include new commands and responses, and it can integrate with external APIs for advanced functionality. Although primarily text-based, it can be extended to support multimedia interactions. This open-source project is available on <a href="https://github.com/mahmud-r-farhan/chatbot.ai">GitHub</a>, allowing developers to contribute and enhance its capabilities.

chatbot.ai: The Chatbot 2.0

CarBar is an innovative ride-sharing platform designed to connect passengers with captains (drivers) for convenient, safe, and reliable transportation. This platform offers a seamless experience with features such as easy ride booking, real-time trip tracking, and driver management. Users can enjoy secure authentication through JWT-based systems and receive real-time updates via push notifications powered by VAPID. The platform's scalable backend is built with MongoDB, Redis, and WebSocket, ensuring efficient data handling and communication. CarBar is currently in beta, welcoming community contributions and feedback. The frontend is developed using React with Vite, styled with Tailwind CSS, and deployed on Vercel, while the backend is powered by Node.js with Express, hosted on Render. This mobile-friendly interface also includes in-app customer support to address user queries and issues, making it a comprehensive solution for modern transportation needs.

CarBar (PWA) is a ride-sharing platform

AnonyPost is a secure platform for anonymous posting on social media, built with a React frontend and a Node.js backend. It ensures privacy, encryption, and moderation to create a safe and open space for users to share thoughts without revealing their identity.

AnonyPost

HTML2MD is a modern, fast, and elegant HTML to Markdown converter built with Vue 3 and TailwindCSS. Whether you're working on documentation, blogs, or Markdown-based tools, this app helps you instantly convert your HTML into clean, readable Markdown.

HTML2MD

Test your math skills with Math Quiz! Engaging math challenges across easy, normal, hard, and genius difficulty levels with real-world scenarios

Math Quiz

Real-Time Location Tracker enables live device tracking with Leaflet, WebSockets, and WebRTC, supporting offline maps and a responsive UI for seamless monitoring.